The invention discloses a communication management system suitable for IMS mobile office and intelligent operation and maintenance. The communication management system comprises a server and a client.The server is used for monitoring and dial testing the network element, analyzing data obtained by monitoring and dial testing, returning an analysis result, comparing the analysis result with a preset security standard, generating danger alarm risk information and sending the danger alarm risk information to the client; and the client is used for receiving and displaying the danger alarm risk information. The invention also discloses a danger alarm method suitable for IMS mobile office and intelligent operation and maintenance. The fault occurrence point can be accurately positioned, detailed alarm information can be transmitted to operation and maintenance personnel in real time, and therefore the operation and maintenance efficiency of the IMS administrative exchange network can be improved.